/* ===== Hero ===== */
  .rt-hero {
    position: relative;
    min-height: 88vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
    background: #050810;
  }

  .rt-hero__bg { position: absolute; inset: 0; z-index: 0; }

  .rt-hero__img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center right;
    opacity: 0.45;
  }

  .rt-hero__gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(
      105deg,
      rgba(5, 8, 16, 0.97) 0%,
      rgba(5, 8, 16, 0.88) 35%,
      rgba(5, 8, 16, 0.55) 60%,
      rgba(5, 8, 16, 0.15) 100%
    );
  }

  .rt-hero__content {
    position: relative;
    z-index: 1;
    text-align: left !important;
    padding: 7rem 4rem 10rem 6rem;
    max-width: 620px;
    animation: pi-fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .rt-hero__content .pi-hero__badge { display: inline-block; }
  .rt-hero__content .pi-hero__cta { justify-content: flex-start; }

  .rt-hero__stats {
    position: absolute;
    bottom: 3rem;
    right: 5%;
    z-index: 2;
    display: flex;
    align-items: center;
    background: rgba(10, 10, 20, 0.72);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem 2rem;
  }

  .rt-hero__stat { text-align: center; padding: 0 1.5rem; }

  .rt-hero__stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    line-height: 1;
    letter-spacing: -0.02em;
  }

  .rt-hero__stat-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.55);
    margin-top: 0.4rem;
    letter-spacing: 0.03em;
  }

  .rt-hero__stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    flex-shrink: 0;
  }

  /* ===== 客戶 logos ===== */
  .rt-clients { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255, 255, 255, 0.1); }
  .rt-clients__label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: rgba(255, 255, 255, 0.4); margin-bottom: 0.75rem; }
  .rt-clients__logos { display: flex; gap: 0.75rem; flex-wrap: wrap; }
  .rt-clients__logos span { font-size: 0.85rem; font-weight: 600; color: rgba(255, 255, 255, 0.65); background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.1); padding: 0.3rem 0.75rem; border-radius: 6px; }

  /* ===== CAD 圖框 ===== */
  .rt-cad-box { position: relative; }
  .rt-cad-box__img {
    width: 100%;
    height: 320px;
    object-fit: contain;
    display: block;
    mask-image: radial-gradient(ellipse 80% 78% at 60% 50%, black 45%, rgba(0,0,0,0.5) 65%, transparent 85%);
    -webkit-mask-image: radial-gradient(ellipse 80% 78% at 60% 50%, black 45%, rgba(0,0,0,0.5) 65%, transparent 85%);
  }
  .rt-cad-box__caption { text-align: center; font-size: 0.78rem; color: rgba(255, 255, 255, 0.35); margin-top: 0.5rem; letter-spacing: 0.04em; }

  /* ===== 創新概念 grid ===== */
  .rt-innovations-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .rt-innov-card {
    background: transparent;
    border: none;
    border-radius: 0;
    overflow: hidden;
    transition: transform 0.3s;
  }
  .rt-innov-card:hover { transform: translateY(-2px); }
  .rt-innov-card__img {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    border-radius: 12px;
  }
  .rt-innov-card__img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s;
  }
  .rt-innov-card:hover .rt-innov-card__img img { transform: scale(1.03); }
  .rt-innov-card__body {
    padding: 1.25rem 1.5rem 1.5rem;
  }
  .rt-innov-card__body h3 {
    font-size: 1rem;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    margin: 0 0 0.5rem;
  }
  .rt-innov-card__body p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.65;
    margin: 0;
  }
  @media (max-width: 700px) { .rt-innovations-grid { grid-template-columns: 1fr; } }

  /* ===== 產品系列卡片 ===== */
  .rt-category-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .rt-series-grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
  }
  .rt-series-grid--3 { grid-template-columns: repeat(3, 1fr); }
  @media (max-width: 900px) { .rt-series-grid--3 { grid-template-columns: 1fr; } }

  .rt-series-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color 0.3s, transform 0.3s;
  }
  .rt-series-card:hover { border-color: rgba(175,0,54,0.3); transform: translateY(-3px); }
  .rt-series-card--highlight { border-color: rgba(175,0,54,0.25); background: rgba(175,0,54,0.04); }

  .rt-series-card__head {
    position: relative;
    background: #0c0e14;
    height: 200px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .rt-series-card--highlight .rt-series-card__head { background: #0e0c14; }

  .rt-series-card__head img {
    width: 85%;
    height: 80%;
    object-fit: contain;
    display: block;
    filter: drop-shadow(0 4px 16px rgba(0,0,0,0.5));
  }

  .rt-series-card__head-fade {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom, transparent, #111520);
    z-index: 2;
  }
  .rt-series-card--highlight .rt-series-card__head-fade {
    background: linear-gradient(to bottom, transparent, #130f1e);
  }

  .rt-series-card__badge-tag {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 3;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #af0036;
    background: rgba(175,0,54,0.1);
    border: 1px solid rgba(175,0,54,0.25);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
  }

  .rt-series-card__body {
    padding: 1rem 1.5rem 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #111520;
  }
  .rt-series-card--highlight .rt-series-card__body { background: #130f1e; }

  .rt-series-card__name {
    font-size: 1.2rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.01em;
    margin-bottom: 0.15rem;
  }
  .rt-series-card__tagline {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.4);
    margin-bottom: 0.75rem;
    letter-spacing: 0.02em;
  }
  .rt-series-card__body p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.6;
    margin: 0 0 1rem;
    flex: 1;
  }

  /* 規格表 */
  .rt-series-card__specs {
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1rem;
  }
  .rt-spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.55rem 0.85rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    gap: 0.75rem;
  }
  .rt-spec-row:last-child { border-bottom: none; }
  .rt-spec-row:nth-child(odd) { background: rgba(255,255,255,0.02); }
  .rt-spec-row__label { font-size: 0.78rem; color: rgba(255,255,255,0.4); font-weight: 500; white-space: nowrap; }
  .rt-spec-row__value { font-size: 0.85rem; font-weight: 600; color: rgba(255,255,255,0.85); text-align: right; }
  .rt-spec-row__value--accent { color: #e8a0b0; }

  .rt-series-card__link {
    font-size: 0.82rem;
    font-weight: 600;
    color: #af0036;
    text-decoration: none;
    transition: color 0.2s;
  }
  .rt-series-card__link:hover { color: #e0004d; }

  /* ===== 量測系統橫幅 ===== */
  .rt-measure-banner {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    overflow: hidden;
    margin-top: 2rem;
    align-items: center;
  }
  .rt-measure-banner__img img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }
  .rt-measure-banner__text {
    padding: 1.5rem 2rem 1.5rem 0;
  }
  .rt-measure-banner__badge {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #af0036;
    margin-bottom: 0.5rem;
  }
  .rt-measure-banner__text h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 0.5rem;
  }
  .rt-measure-banner__text p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.65;
    margin: 0 0 1rem;
  }
  @media (max-width: 700px) {
    .rt-measure-banner { grid-template-columns: 1fr; }
    .rt-measure-banner__text { padding: 1.25rem; }
  }

  /* ===== 應用場景 ===== */
  .rt-apps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .rt-app-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 14px;
    padding: 1.5rem;
    transition: border-color 0.3s;
  }
  .rt-app-card:hover { border-color: rgba(175,0,54,0.25); }
  .rt-app-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    margin: 0 0 0.5rem;
  }
  .rt-app-card p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.6;
    margin: 0 0 0.75rem;
  }
  .rt-app-card__series {
    font-size: 0.75rem;
    font-weight: 600;
    color: #af0036;
    letter-spacing: 0.04em;
  }
  @media (max-width: 600px) { .rt-apps-grid { grid-template-columns: 1fr; } }

  /* ===== 工程技術服務 ===== */
  .rt-eng-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 4rem;
    align-items: start;
  }
  .rt-eng-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  .rt-eng-list li {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
  }
  .rt-eng-check {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    background: rgba(175,0,54,0.15);
    border: 1px solid rgba(175,0,54,0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    color: #af0036;
    margin-top: 0.15rem;
  }
  .rt-eng-list li strong {
    display: block;
    color: rgba(255,255,255,0.9);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
  }
  .rt-eng-list li p {
    margin: 0;
    color: rgba(255,255,255,0.45);
    font-size: 0.85rem;
    line-height: 1.6;
  }

  /* PDF 下載卡片 */
  .rt-pdf-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 2rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    position: sticky;
    top: 2rem;
  }
  .rt-pdf-card__icon { width: 48px; height: 48px; color: rgba(255,255,255,0.4); }
  .rt-pdf-card__icon svg { width: 100%; height: 100%; }
  .rt-pdf-card__label {
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
    margin-bottom: 0.25rem;
  }
  .rt-pdf-card__title {
    font-size: 1.05rem;
    font-weight: 600;
    color: rgba(255,255,255,0.88);
    line-height: 1.4;
  }
  .rt-pdf-card__meta { font-size: 0.75rem; color: rgba(255,255,255,0.3); }
  .rt-pdf-card__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #af0036;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.65rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
    width: fit-content;
  }
  .rt-pdf-card__btn:hover { background: #c8003f; }

  @media (max-width: 768px) {
    .rt-hero__content { padding: 5rem 1.5rem 8rem 1.5rem; }
    .rt-hero__stats { position: relative; bottom: auto; right: auto; margin: 0 1.5rem 2rem; justify-content: space-around; }
    .rt-hero__stat { padding: 0 1rem; }
    .rt-eng-layout { grid-template-columns: 1fr; gap: 2rem; }
    .rt-pdf-card { position: static; }
  }